It depends on the cross section which may be circular, elliptical, square, rectangular or of a more complex shape.
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If the bar is circular then it is: pi*radius square
3.1416"Answer:3.1416 square inches.
The area between bar lines
The dot of an 'i' is called a tittle and the cross of a 't' is called a T-bar.
A histogram is a kind of bar chart in which the bars are not all of the same width, and the heights of the bars are such that the area of each bar represents the frequency for that category.